Antenna



FIG. 1 is a top plan view of an antenna;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top perspective view thereof;

FIG. 5 is a top plan view thereof, with the broken line environment notshown; and,

FIG. 6 is a front elevation view thereof, with the broken lineenvironment not shown.

The broken lines show environment only and form no part of the claimeddesign.

CLAIM The ornamental design for an antenna, as shown and described. 